Micro-speaker Tapered Cavity Diaphragm Vibration Space
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Solution Overview
Problem
The reduction in size of portable electronic device speakers limits the space available for diaphragm vibration, compromising acoustic performance.
Innovation Solution
A micro-speaker design featuring a case with a peripheral plate that includes an inclining surface forming a tapered cavity, providing additional space for diaphragm vibration without restricting movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speaker volume is reduced to meet miniaturization trends, then the device size is reduced, but the space for diaphragm vibration is limited and acoustic performance deteriorates
Solution Approach 1:
The patent introduces a tapered cavity structure that extends in the depth direction (z-axis) beneath the diaphragm, transforming a two-dimensional planar space constraint into a three-dimensional volumetric solution. This allows the diaphragm to vibrate freely in the depth dimension while maintaining a compact overall speaker footprint, effectively resolving the contradiction between miniaturization and acoustic performance.
Solution Approach 2:
The speaker structure is segmented into distinct functional zones: the vibration chamber for diaphragm movement, the tapered cavity for acoustic wave guidance, and the sound hole for sound output. This segmentation allows each component to be optimized independently, enabling the diaphragm to have sufficient vibration space while the overall speaker maintains a compact form factor.
2Volume of moving object
If the speaker volume is reduced, then the device size is reduced, but the space for diaphragm vibration is reduced
Solution Approach 1:
The patent utilizes the depth dimension by creating a tapered cavity that extends downward from the diaphragm plane. This vertical expansion allows the diaphragm to have adequate vibration space without increasing the speaker's planar footprint, effectively decoupling the vibration space requirement from the overall speaker volume.
Solution Approach 2:
The tapered cavity is nested within the speaker housing structure, with the diaphragm positioned above it. This nested arrangement allows the vibration space to be contained within the overall speaker volume, maximizing the use of available space while maintaining compact dimensions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances acoustic performance by allowing unhindered diaphragm vibration within the tapered cavity, improving sound wave generation in compact speaker systems.
Implementation Method 1
While electrified, the voice coil will be activated to vibrate by the Lorenz Force and further drives the diaphragm to vibrate, which converts the electrical signals to sound waves.
Data Source
AI summary
A micro-speaker includes a frame, a case supported by the frame, a sound generator located between the frame and the case. The case has a sound hole and a peripheral plate surrounding the sound hole. The peripheral plate includes an outer surface, an inner surface and an inclining surface extending from the inner surface toward the outer surface.